thermal-runaway
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| Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
| thermal-runaway [2019/02/18 20:12] – samuelpinches | thermal-runaway [2019/02/18 20:28] – samuelpinches | ||
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| In Marlin firmware, there are a series of settings that enable the firmware to monitor the temperatures and thermal progress of the hot-end(s) and heated bed of a 3D Printer. Should a condition occur that is outside the ‘safe boundaries’ set in the firmware, it can shut down the heaters and all printing processes to help prevent damage to the 3D Printer, and avoid dangerous situations such as a potential fire. | In Marlin firmware, there are a series of settings that enable the firmware to monitor the temperatures and thermal progress of the hot-end(s) and heated bed of a 3D Printer. Should a condition occur that is outside the ‘safe boundaries’ set in the firmware, it can shut down the heaters and all printing processes to help prevent damage to the 3D Printer, and avoid dangerous situations such as a potential fire. | ||
| - | I need to stress here, however, that **these settings, and the Marlin firmware itself, cannot guarantee absolute Thermal Runaway Protection under all circumstances**. These are not absolute fail-safes, nor are they idiot proof. The final section | + | I need to stress here, however, that **these settings, and the Marlin firmware itself, cannot guarantee absolute Thermal Runaway Protection under all circumstances**. These are not absolute fail-safes, nor are they idiot proof. The final sections |
| <alert danger> | <alert danger> | ||
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| ==== Thermal Runaway Safety Monitoring Settings in Marlin ==== | ==== Thermal Runaway Safety Monitoring Settings in Marlin ==== | ||
| - | Let’s now go through each of the settings in the Marlin firmware (as of release 1.1.9) and cover what they are each for: | + | Let’s now go through each of the thermal runaway |
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| + | <alert info> Note: Many features in Marlin can be enabled or disabled. In most cases, features are disabled when they are ' | ||
| + | |||
| + | **Here' | ||
| + | < | ||
| + | **Here' | ||
| + | < | ||
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| ---- | ---- | ||
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| What it is:\\ | What it is:\\ | ||
| - | **These are the two most important settings for thermal protection in Marlin**. If these are disabled (having two slashes in front of them ‘%%// | + | **These are the two most important settings for thermal protection in Marlin. If these are disabled (by commenting out), then there is no Thermal Runaway Protection at all** – regardless of any of the other items covered here. |
| What it does:\\ | What it does:\\ | ||
| - | When enabled (no slashes before the ‘# | + | When enabled (no slashes before the ‘# |
| How to use it:\\ | How to use it:\\ | ||
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| **Here are some precautions and best practices when operating your 3D Printer.** | **Here are some precautions and best practices when operating your 3D Printer.** | ||
| + | |||
| + | * Ensure you have a **fire extinguisher** (pick one suitable for electronic fires) within the room your printer is operating. | ||
| + | * Ensure you have a **working Smoke Alarm** within the room your printer is operating. | ||
| * Do not turn on your printer’s heaters if the thermistors are not initially reporting temperatures near your room’s temperature (when fully cooled) or, if a thermistors is not connected or physically attached to the heater it is responsible for monitoring (e.g. stuck down to the the print bed or mounted in the nozzle heater block). | * Do not turn on your printer’s heaters if the thermistors are not initially reporting temperatures near your room’s temperature (when fully cooled) or, if a thermistors is not connected or physically attached to the heater it is responsible for monitoring (e.g. stuck down to the the print bed or mounted in the nozzle heater block). | ||
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| A 3D printer with a shorted MOSFET will immediately start to heat up once power is turned on - and will not obey any instructions from the safety systems to turn off. In that circumstance Thermal Runaway will occur, and this may generate smoke, toxic fumes and can potentially cause a fire. | A 3D printer with a shorted MOSFET will immediately start to heat up once power is turned on - and will not obey any instructions from the safety systems to turn off. In that circumstance Thermal Runaway will occur, and this may generate smoke, toxic fumes and can potentially cause a fire. | ||
| - | A MOSFET short can occur randomly at any time, without any apparent cause. For this reason, lastly, and absolutely: | + | Since a MOSFET short can occur randomly at any time, without any apparent cause. For this reason, lastly, and absolutely: |
| ==== NEVER LEAVE AN OPERATING 3D PRINTER UNATTENDED ==== | ==== NEVER LEAVE AN OPERATING 3D PRINTER UNATTENDED ==== | ||
| + | |||
| + | Stay safe, and happy printing! | ||
| -- //DaHai Zhu// | -- //DaHai Zhu// | ||
thermal-runaway.txt · Last modified: 2020/12/25 02:13 by 127.0.0.1
